Building Orca - Episode 20: Lofting Pt. 1 - Grid Lines
December 15, 2025 · 20 min · 19K views
What this video covers
Boatbuilder Louis Sauzedde lays out the complete process for constructing and ruling a lofting grid on a plywood loft floor during the building of Orca. The floor consists of half-inch plywood over 2x4 framing, with quarter-inch plywood on top; sheets are bar-clamped tight against each other before fastening to produce a straight centerline.▶ 1:01 Because the cement floor has a slight hump, Sauzedde suspends the baseline string on small spacers so it never touches the plywood, then transfers marks to the surface every foot using a small square block and a soft Powermatic pencil held vertically.▶ 6:06 He explains why chalk-snap lines are avoided — they can land in two or three spots — and why soft pencils are essential: a hard pencil cuts a groove in the painted plywood that cannot be erased.▶ 3:24 A 90-degree cross-grid is established using the 3-4-5 Pythagorean theorem rather than a physical square, then a 50-foot tape marks longitudinal lines every three feet.▶ 15:27 The full grid is completed in one day.▶ 15:43 Sauzedde also demonstrates sharpening a carpenter pencil on a hand-plane blade.▶ 17:12 He notes that drawing the lines' offset at half-inch-to-the-foot scale on the drawing board compressed the buttock lines aft, a problem that disappears at full scale on the loft floor.▶ 16:40
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